My fellow Wii owners have left out Metroid Prime 3 (fantastic controls and boss battles!). Personally, I thought that the Twighlight Princess is the best Zelda game ever (Some days I would say Windwaker). Super Smash Bros. and Mario Kart - you either need friends or online capabilities for maximum fun.
One obscure but really fun game is The Pinball Hall of Fame-The Williams Collection. If you enjoy pinball, you can't get any closer to the real thing without an actual table (the ball physics and bumping and nudging controls are fantastic!)
The control system alone makes Medal of Honor Heroes 2 worth at least a rental. Pumping the shotgun, bazooka on your shoulder, twisting the zoom on your sniper rifle, even twisting the dial on the radio.
Don't expect the graphics of 360, but expect alot of fun.
"You have earned the right to fight the Black Knight Again"
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